| 张超,李国强.建筑大空间火灾模拟及升温计算简单公式[J].火灾科学,2012,21(2):84-91. |
| 建筑大空间火灾模拟及升温计算简单公式 |
| Simple formulae for calculating the gas temperature in large enclosure fire environment |
| 投稿时间：2011-11-30 修订日期：2011-12-29 |
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| DOI：10.3969/j.issn.1004-5309.2012.02.06 |
| 基金项目: |
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| 中文关键词: 建筑大空间 火灾 温度计算 简单公式 火灾动力学模拟 |
| 英文关键词:Large enclosure Fire Temperature calculation Simple formulae Fire dynamic simulation |
| 摘要点击次数: 676 |
| 全文下载次数: 904 |
| 中文摘要: |
| 钢结构经常用于建筑大空间环境。因为使用和功能要求，建筑大空间内通常无法设置防火墙来阻止火灾的水平传播，而是通过设置燃烧岛、防火舱及防火隔离带等措施将可燃物限制在一定区域内。大空间内可能的火灾为区域火灾。给出了模拟大空间火灾的理论模型和升温计算简单公式。公式基于火羽流相关理论，并引入工程相关常数得到。通过工况分析，考察了两种不同火灾场景，公式的计算结果与场模拟软件FDS结果进行了比较，二者符合良好。所给出的公式形式简单，式中参数的物理意义明确，推荐用于实际工程计算。 |
| 英文摘要: |
| Steel structures are widely used in large enclosure. Limited by its performance and functions, a large enclosure is usually not permitted to be departed by fire walls for preventing horizontal fire spread. Instead, fire loads in the large enclosure are controlled in a special area by using the concept of island, cabin or isolation space in performance-based fire safety design. As a result, the potential fires in the large enclosure are characterized as localized fires. This paper proposes simple formulae for calculating the gas temperature in large enclosure. The formulae are based on the classic plume theory with adopting the commonly used constants in engineering. Case studies for two different fire scenarios are conducted. The calculated results agree well with those by the simulation results using the software of FDS. With a simple form, the proposed formulae are recommended for practical usages. |
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